Rogers field



Flushing Tanks. Pate'ntd Dec; 23, I879.

R. Siphon for Sewage Inventor.-

. Rogers FieId .7

N PEIERS. PNOTD-LITROGRAPNER. WhSHWGTON. D. (3

UNITED STATES-PATENT OFFICE.

ROGERS FIELD, OF WESTMINSTER, COUNTY OF MIDDLESEX, ENGLAND.

IMPROVEMENT IN SlPHONS FOR SEWAGE AND FLUSHING TANKS.

Specification forming part of Letters Patent No. 222,885, dated December23, 1879 application filed October 8, 1879; patented in England, October28, 1875.

To all whom it may concern:

Be it known that I, ltoenns FIELD, of No. 5 Gannon Bow, Westminster,county of Middlesex, England, have invented an Improved IntermittentSiphon for Sewage and Flushing Tanks; and I do hereby declare that thefollowing description, taken in connection with the accompanyingdrawings, hereinafter referred to, forms a full and exact specificationof the same, wherein I have set forth the na- 1 ture and principles ofmy said improvement,

by which my invention may be distinguished from others of a similarclass, together with such parts as I claim and desire to secure byLetters Patentthat is to say:

My invention relates to an improved intermittent siphon for sewage andflushing tanks, so constructed that notwithstanding a slow and gradualsupply to the tank the siphon I comes fully into action when the liquidin the tank attains a certain level, and that its action becomescompletely arrested when the liquid has been drawn off by the siphon toa certain lower level.

In the accompanying drawings, Figure 1 represents a vertical section ofthe siphon as placed in a tank with its disch arge-trough, and

Fig. 2 is a sectional plan of the siphon.

I It consists of two concentric tubes, A and B, the outer one, A, beingclosed at the top, and steadied and supported by three radial ribs, 1),projecting from the inner tube, B.

The annular space between A and B constitutes the ascending limb of thesiphon,the

inner tube, B, forming the descending limb.

. At the upper mouth of B is fixed a conical shell, 0, projecting inwardclear from the inner surface of the tube B. The lower mouth of Bdischarges into a trough, D, which has a weir,'d, level with thedischarge-mouth of B,

1 and over this weir is placed a secondary siphonpipe, E, the innermouth of which is below the level of the mouth of B.

While the tank is being filled up to the level of the top of the innertube, B, there is no siphon action; but after it has been so filled avery little rise of the level, however slow may be the supply tothetank, has the effect of starting the siphon action in the followingmanner: A portion of the liquid overflowing the top of B descends by itinto the trough D, which it fills to the level of the weir 0?, therebysealin g the lower mouth of B. A further portion of liquid overflowingthe top of B is directed by the shell 0 so as to descend in B clear fromits interior surface, thus displacing the air in B and fully startingthe siphon action, which goes on till the liquid in the tank reaches thelevel of the lower mouth of A, after which air is admitted by that mouthto the siphon. Meanwhile, owing to the rapid supply from the siphon A Bto the trough D, the secondary siphon E has become charged, and when thesupply to D is checked by the admission of air to A B, as abovedescribed, the siphon E continues in action and draws ofl' liquid fromthe trough D suflicicntly to unseal the lower mouth of B, whereupon theaction of the siphon A B is completely arrested, and presently theaction of the secondary siphon E is also stopped by the admission of airthereto. Things remain in this condition until the tank is again filledto the level of the top of the inner tube, B, whereupon the action abovedescribed is repeated.

Instead of carrying the shell (3 quite round the mouth of B, a portionof it may project inward as a lip at one place, sufficient to projectthe liquid into the middle of the tube B without permitting it to strikethe side.

I find it also of advantage to provide a small protuberance, such as F,or roughness at the top of the tube B, as this has the effect ofbreaking the stream, and thereby more effect.

ually displacing the air.

Furthermore, a notch, a, formed in the lower mouth of the tube A, hasthe eflect of more completely arresting the siphon action by theadmission of air when vthe lower level of the I have described anannular form of siphon as being compact, and also giving great facilityfor cleansing by lifting off the outer tube, A.

Where it is objectionable to cnta hole through the tank-bottom, a bentsiphon may be employed as indicated by the dotted lines A. Thedescending limb B being constructed and arranged as described withreference to the annular form of siphon, a would represent the notch inthis case.

Having thus described the nature of my in Vention, and the best means Iknow of putting it into practical operation, I claim- 1. In combinationwith the descending limb of a siphon, the shell or lip O, substantiallyas herein described.

2. In combination with the descending limb of a siphon, thedischarge-trough D and secondary siphon E, substantially as hereindescribed.

In testimony whereof I have signed my name to this specification, in thepresence of two subscribing Witnesses, this 20th day of August, 1879.

ROGERS FIELD. Witnesses:

CHAS. D. ABEL, JNo. I M. MILLARD.

